Site /feed.xml is RSS 2.0, fix auto-discovery header
Site /feed.xml is RSS 2.0, fix auto-discovery header

Refs #2996

LuoPX-15510486969/jekyll,liukaijv/jekyll,omeripek/jekyll,ajhit406/jekyll,alihalabyah/jekyll,chiyodad/jekyll,richsoni/jekyll,nickg33/jekyll,dezon/jekyll,jmknoll/jekyll,rasa2011/rasa2011.github.io,ReachingOut/jekyll,pheuko/jekyll,eloyesp/jekyll,goragod/jekyll,tomasdiez/jekyll,floydpraveen/jekyll,teju111/jekyll,fulldecent/jekyll,vcgato29/jekyll,noikiy/jekyll,AtekiRyu/jekyll,abhilashhb/jekyll,omeripek/jekyll,ZDroid/jekyll,jekyll/jekyll,gaosboy/jekyll,ewinkler/jekyll,nateberkopec/jekyll,harrissoerja/jekyll,m2candre/jekyll,derekgottlieb/jekyll,backendeveloper/jekyll,abhilashhb/jekyll,shuber2/jekyll,pmarsceill/jekyll,digideskio/jekyll,noikiy/jekyll,sanxore/sanxore.github.com,aarvay/jekyll,imaustink/jekyll,ZDroid/jekyll,MauroMrod/jekyll,leichunxin/jekyll,jeffkole/jekyll,ajhit406/jekyll,johnnycastilho/jekyll,jekyll/jekyll,tomjohnson1492/jekyll,thejameskyle/jekyll,jeffkole/jekyll,Tyrion22/jekyll,m2candre/jekyll,martynbm/jekyll,superve/jekyll,nateberkopec/jekyll,wentixiaogege/jekyll,alihalabyah/jekyll,ZainRizvi/jekyll,vidbina/jekyll,jaroot32/jekyll,zsyed91/jekyll,jmhardison/jekyll,sasongkojati/jekyll,xiaoshaozi52/jekyll,nemotan/jekyll,rovrevik/jekyll,UniFreak/jekyllcn,johnnycastilho/jekyll,derekgottlieb/jekyll,penchan1218/jekyllcn,dansef/jekyll,garvitr/jekyll,PepSalehi/jekyll,darwin/jekyll,alfredxing/jekyll,tillgrallert/jekyll,christophermanning/jekyll,xcatliu/jekyllcn,krishnakalyan3/jekyll,tomjohnson1492/jekyll,chrisfinazzo/jekyll,honger05/jekyllcn,harrissoerja/jekyll,honger05/jekyllcn,getandpost/jekyll.github.io,alex-kovac/jekyll,FlyingWHR/jekyll,oresmus/jekyll,bsmr-ruby/jekyll,digideskio/jekyll,egobrightan/jekyll,tareq-s/jekyll,mixxmac/jekyll,darwin/jekyll,nickg33/jekyll,0x00evil/jekyll,daniel-beck/jekyll,thetaxman/jekyll,fengsmith/jekyll,fulldecent/jekyll,christophermanning/jekyll,omeripek/jekyll,desidude03/jekyll,UniFreak/jekyllcn,xcatliu/jekyllcn,eninya/jekyll,AnanthaRajuC/jekyll,SQS2/Test,ryanshaw/jekyll,gencer/jekyll,bsmr-ruby/jekyll,superve/jekyll,gkunwar/gkunwar.github.io,codeclimate-testing/jekyll,kuangyeheng/jekyll,imaustink/jekyll,royalwang/jekyll,tillgrallert/jekyll,desidude03/jekyll,AnanthaRajuC/jekyll,Tiger66639/jekyll,stevecrozz/jekyll,jmknoll/jekyll,goragod/jekyll,18F/jekyll,rongl/jekyll,chiyodad/jekyll,teju111/jekyll,xantage/jekyll,QuinntyneBrown/jekyll,EddieDow/jekyll,imaustink/jekyll,sasongkojati/jekyll,chrisfinazzo/jekyll,tylermachen/jekyll,vidbina/jekyll,tillgrallert/jekyll,pmarsceill/jekyll,Wirachmat/jekyll,thejameskyle/jekyll,julienbourdeau/jekyll,brint/jekyll,angeliaz/jekyll,xantage/jekyll,tugberkugurlu/jekyll,nathanhorrigan1/webdeveloper,shuber2/jekyll,xiebinhqy/jklly_china,tomasdiez/jekyll,ewinkler/jekyll,hartmel/jekyll,tugberkugurlu/jekyll,zhangkuaiji/jekyllcn,fengsmith/jekyllcn,dezon/jekyll,rajrathore/jekyll,howkj1/jekyll,0x00evil/jekyll,sasongkojati/jekyll,richsoni/jekyll,alihalabyah/jekyll,fulldecent/jekyll,cyberid41/jekyll,gynter/jekyll,chinayin/jekyll,zsyed91/jekyll,superve/jekyll,hubsaysnuaa/jekyll,fulldecent/jekyll,shliujing/jekyll,larryfox/jekyll,MjAbuz/jekyll,mrb/jekyll,MauroMrod/jekyll,doubleday/jekyll,tomjohnson1492/jekyll,tobscure/jekyll,iRoxx/jekyll,hubsaysnuaa/jekyll,drobati/jekyll,tamouse/jekyll,jmhardison/jekyll,jmepg/jekyll,martynbm/jekyll,dangaute/eng,harrissoerja/jekyll,AtekiRyu/jekyll,doubleday/jekyll,thetaxman/jekyll,CheekyFE/jekyll,AaronSikes/jekyll,ajhit406/jekyll,chinayin/jekyll,AaronSikes/jekyll,marrujoalex/jekyll,saitodisse/jekyll,greent2008/jekyll,jekyll/jekyll,gkunwar/gkunwar.github.io,xtymichael/jekyll,xiebinhqy/jklly_china,Kinghack/kinghack.github.com,x-way/jekyll,jmepg/jekyll,greent2008/jekyll,adilapapaya/jekyll,x-way/jekyll,yihangho/jekyll,winndows/jekyll,alfredxing/jekyll,eloyesp/jekyll,jaybe-jekyll/jekyll,x-way/jekyll,EddieDow/jekyll,Teino1978-Corp/Teino1978-Corp-jekyll,penchan1218/jekyllcn,Kinghack/kinghack.github.com,Teino1978-Corp/jekyll,stomar/jekyll,vcgato29/jekyll,thetaxman/jekyll,derekgottlieb/jekyll,Wirachmat/jekyll,liukaijv/jekyll,Tiger66639/jekyll,ReachingOut/jekyll,kimeng/jekyll,garvitr/jekyll,gencer/jekyll,christophermanning/jekyll,tobscure/jekyll,ramoslin02/jekyll,ryanshaw/jekyll,krahman/jekyll,stomar/jekyll,indraj/jekyll,rajrathore/jekyll,pheuko/jekyll,noikiy/jekyll,yihangho/jekyll,johnnycastilho/jekyll,Teino1978-Corp/jekyll,alex-kovac/jekyll,LeuisKen/jekyllcn,EddieDow/jekyll,xiebinhqy/jklly_china,Strangehill/jekyll,alex-kovac/jekyll,xiongjungit/jekyll,kuangyeheng/jekyll,tobscure/jekyll,fengsmith/jekyll,brint/jekyll,fabulousu/jekyll,zsyed91/jekyll,eloyesp/jekyll,digideskio/jekyll,princeofdarkness76/jekyll,xantage/jekyll,jmptrader/jekyll,jmknoll/jekyll,nathanhorrigan1/webdeveloper,floydpraveen/jekyll,derekgottlieb/jekyll,isathish/jekyll,rlugojr/jekyll,xiaoshaozi52/jekyll,tamouse/jekyll,marrujoalex/jekyll,LeuisKen/jekyllcn,tylermachen/jekyll,mnuessler/jekyll,ls2uper/jekyll,rasa2011/rasa2011.github.io,m2candre/jekyll,pmarsceill/jekyll,CPVPLachlan/CPVP-Blog,MjAbuz/jekyll,shliujing/jekyll,bsmr-ruby/jekyll,hubsaysnuaa/jekyll,Teino1978-Corp/Teino197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